This is Whooflet, a bit of an older pony but not all that much more mature than the younger ponies he tends to hang around with. A recluse most of the time, Whooflet only really sees the light of day due to his obnoxious and sometimes abusive friend Sketch.

Before most other pony's were around, Whooflet became best friends with Doctor Whoof, but hasn't gone on any adventures lately.

Only problem is that he's a bit sickly, which accounts for his IV bag cutie mark. *smacked into last Tuesday*

(Fun fact, if you put this and the Sketch pony together, they create a "YOU DID THIS" "why dear, what are you talking about?" diptych.)